Questions tagged [torque]

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Which one has a higher output torque PMSM or BLDC motors? Does having a higher rpm mean having high torque? [closed]

Hey I am researching PMSM and BLDC motors for a project where I make a brushless motor and I had a few questions: Which one has a higher output torque PMSM or BLDC motors? and Does being fast mean ...
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1answer
35 views

How reliable are motor power ratings through time (old motors vs new motors)?

I'm making this question here because I'm a little bit confused with what I've been seeing from some old and new 1/2 hp motors. I've bought a 1/2 hp induction motor (4-pole, single phase, capacitor ...
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1answer
43 views

What is the best way to measure and record the power consumption of a servo motor accurately?

I can obtain the rotational angle and velocity of a servo motor. However, I cannot obtain the current nor torque while the motor is turning. What is the best way to measure the power consumption of a ...
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1answer
37 views

BLDC Motor question

Im looking for a solution, i have a 3kW 320V 3000rpm rated BLDC motor with position hall encoder and a chinese driver. The hall-feedback is working with it. I would like to use motor between 15 and ...
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2answers
124 views

Using a motor as a brake

I want to use the motor of an electric vehicle as a brake. It is a 36V ~27A motor. I looked up 500W+ resistors and they are quite pricey, I figured the cheapest alternative would be 100W resistors in ...
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1answer
264 views

Old Record Player Motor Doesn't Have Torque To Start

I am restoring a jukebox from 1953 (AMI E-120). Everything is going fine except the main drive motor, an A/C induction motor, cannot start under the load of the platter. It starts fine when the ...
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2answers
135 views

Do Induction Motors only work if the rotor's coils have a finite resistance?

I just did some calculations, and to me it seems that the induction motor only works when the rotors coils have finite resistance: I will show that for a single conducting loop, whose current is ...
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2answers
63 views

Relationship between torque and back-EMF voltage | BLDC motor modeling

I want to simulate an BLDC motor, so I am studying corresponding mathematical model. My problem is that I am little bit confused by the torque equation. \$e_a\$, \$e_b\$, \$e_c\$ - Back-EMF voltages (...
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3answers
113 views

How do i know what resistor value, that's attached to a BLDC motor, i should use in order to get a torque of 100 lb-ft put on my actuator?

Motor P/N is M-3441Y-LN-02D. Back EMF [Ke] is 38.95 (Vpeak/Krpm). Continuous torque 2.495 lb-ft. User manual. I want to run the actuator coupled with the BLDC motor 60:1 gear ratio in reverse. So the ...
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3answers
52 views

How can these two motors produce the same torque if their volt/amp ratings are different and their watts/RPM are the same

My rudimentary understanding of a DC brushed motor is speed is proportional to voltage and torque is proportional current. Therefore a 36 volt 500 watt motor should have a higher RPM rating and a ...
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2answers
49 views

Torque and Flux Current

It is said that vector sum of flux and torque current equal to total current drawn by the motor but there are also some currents flowing due to copper losses and rotor leakage inductance. In my ...
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2answers
526 views

How to electrically brake a brushless motor

I'm sorry if this question is too stupid, unfortunately I have a very low experience with BLDC motors. I would like to use 4 x 350W, 24VDC brushless motor hubs for my wheeled robot (they are usually ...
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0answers
17 views

BLDC and Stepper motor torque ration meaning

Ok so after searching on the internet for a pretty long time there are a lot of undefined or roundabout articles about torque for both motors. Hybrid bipolar stepper motor torque. This one is a little ...
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2answers
54 views

How Can I Efficiently Adjust Difficulty on a Pedal Generator without Mechanical Gears?

I'm charging a battery using pedal power, like this: pedals -> brushless generator -> rectifier -> charge controller -> battery I'd like to be able to ...
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1answer
42 views

Rotor Current and Torque Producing Current in Induction Motor

Is rotor current of an Induction motor always same with torque producing current? In torque equation of Induction motor, there is also one factor called rotor power factor. if rotor current and torque ...
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2answers
62 views

Is the calculation of weight to be suspended inorder to produce electricity from an alternator correct or not?

I bought a alternator with the following specs: power: 5 hp rpm: 1800 voltage: 220V The formula for finding the horsepower is: horsepower= (RPM X Torque)/5252 By substituting the value of horsepower ...
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2answers
48 views

Holding torques of a 7W stepper and a 48W stepper

Does anyone know why a 2.5V 2.8A (=7W) stepper has a holding torque of 1Nm whilst a 24V 4A (=48W) stepper has a holding torque of only 2.7Nm: Stepper 1: Stepper 2: The latter draws 7x the power, ...
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4answers
651 views

Electrical Motors and Frequency

I was musing about electric motors after seeing one randomly on TV, and there's something I'm must be remembering incorrectly. It's just a thought experiment, so I'm imagining some theoretical DC ...
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1answer
26 views

DC series machine

What is the different between electrical and mechanical torque? and How to find the mechanical torque if electrical torque is given?
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1answer
44 views

Torque issues with DC motor

I am currently trying to use a DC motor with a lead screw to eventually open an close a window. My window requires around 2 kg's of force to open and the distance that needs to be traveled is 20 ...
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1answer
32 views

how do i calculate stall torque 5.4kg@ 5v 1000mA?

i came to this website https://www.letsbuyrobots.com/en/robot-humanoide-ls-868, and i want to know the servo spec especially the stall torque, and then i found this "2) Torque:5.4kg@5v 1000mA, Power: ...
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1answer
63 views

Calculations for a DC motor

I want to open and close a window using a DC motor and a lead screw. My window is 20 inches long. I know buying recommendations are outside the scope of this forum. I have little to no knowledge ...
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1answer
74 views

Induction motor starting torque and pull out torque

Recently I was doing some work on the induction motor where I found some general theory on starting speed torque curve of the induction motor. Where the theory is the starting torque will be 1.5x of ...
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1answer
29 views

Sanity check for max motor torque

A KDE brushless DC motor has: Kt = 0.0189 N*m/A (Kv = 505 rpm/V) R = 7 mΩ voltage range of about 30-60 VDC Specsheet link Assume the motor is connected to 30 VDC input ideal, sensored, six-step ...
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0answers
37 views

DC Motors Voltage Equation versus Power Equation

I understand the voltage equation and the power equation for DC motors. But somehow I have a problem understanding moving from one to the other. I am not interested in the IR or IdL/Dt so I will ...
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1answer
41 views

How to conceptualize electric loading in a motor

I'm struggling to understand the concept of "electric loading" or "current density" in a real motor. Soong explains how a sheet of conductors in a magnetic field generate force on that sheet which I'...
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1answer
40 views

How does gearing affect power generated by a permanent magnet DC motor?

I am currently working on a project to harvest electrical energy from a rowing machine. I am trying to make use of gearing ratios to adjust the resistance level offered by the system, and the impact ...
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0answers
26 views

Problem calculating winding temperature in a brushed DC motor

I'm building a rig for measuring pull out torque for stepper motors, and am looking at dynamic braking and plugging of a permanent magnet DC motor which will be used to apply a variable braking torque....
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1answer
49 views

Motor that has at least 50in-lbs of torque and 200RPM [closed]

I need a motor that has at least 50in-lbs of torque and turns 200 times in one minute (200RPM) THIS screw driver has inside the motor that I need. I do not want to buy the electric screwdriver I ...
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1answer
114 views

Can a stepper motor produce enough torque to open a door?

From a few sources, I read that a stepper motor produces more torque at slow speeds. I want to create an automatic door opener (for a living room). Can a stepper motor produce enough torque for this ...
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1answer
43 views

The effects on torque/slip when changing speed?

I know that the number of poles altering frequency and voltage changes the speed but I don't know how either alters the torque or slip.
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2answers
57 views

“Digital Clutch” For Electric Motor

I am in the design phase of a piece of machinery that needs a "Digital Clutch." Requirements of the project: Machine must run at several different constant RPM settings. Machine needs to ability ...
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0answers
31 views

Confusion with peak and RMS values when calculating the torque of an electric motor

For electric 3-phase motors with a efficiency of 100% (assumed here for simplicity) the following equation holds: $$P = \omega T = 3 U I$$ where \$U\$ and \$I\$ are the phase RMS values of the ...
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1answer
29 views

How to determine the right spec of a servo motor given an inertia moment?

I'm working on a trash bin which lid is controlled (opened/closed) by a microcontroller and thus i decided to use a servo motor. The lid is 47 x 47 x 0.1 cm and because its made from steel has a ...
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0answers
115 views

Torque calculation in FEMM

I want to calculate the torque of my PMSM in FEMM. I'm a little bit struggling with the signs of the results. First, I draw a line counter-clockwise in the airgap and calculate the torque via the '...
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0answers
37 views

Stepper motor and driver selection

I would appreciate some advice on selecting a proper stepper motor and driver for my project. I plan to create an autopilot for my small fishing boat using a Raspberry Pi controlling a stepper motor, ...
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1answer
56 views

What is the exact formula relating a DC motor's input voltage and torque produced?

I'm trying to control a 12V geared DC motor with encoder through an Arduino by an L298D driver for my self balnace bot. Based on the angles from the attached gyro sensor and encoder, it calculates ...
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1answer
38 views

Stall torque for servo

My understanding of stall torque is that it's the amount of torque produced by the servo when the output is stationary. Suppose the stall torque of a servo was 10kg-cm. It can lift the a 10kg load at ...
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3answers
190 views

BLDC motor current sensing for load torque

I would like to control 14V BLDC motor of battery powered drill. What I want to do remake the drill to nut runner (torque wrench), so I need to sense a motor current which is proportional to motor ...
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1answer
100 views

Why does rotor of synchoronous generator accelerate during faults?

I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator? Why does electrical torque decrease during fault in lines that ...
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2answers
27 views

Driving torque and load torque of a pmdc motor

This question is a follow up to the question I had asked on electric torque of DC motors I've done my research but couldn't find a satisfactory answer. I would appreciate if the answer was told with ...
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3answers
130 views

Understanding electric torque of a motor

I'm missing something fundamental in my understanding of the torque of a motor. Consider the following analogy: I have a 10kg dumbell on the ground and a 1kg dumbell next to it. Let's say that I ...
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3answers
119 views

Is there a cheap and accurate electromechanical method to provide a configurable counter-torque?

Given a continuously rotating motor shaft, is there a cheap and accurate electromechanical method that would provide a configurable counter-torque? Rotation is in one direction only, RPM range is 0 - ...
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2answers
68 views

Relating input torque on BLDC motor shaft with output current

I am trying to build a drone generator with a gasoline engine and a 14-pole,170KV, 2KW BLDC skateboard motor (this one). Before designing the system and running it, I wanted to clear out a fundamental ...
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1answer
48 views

Coordination of mechanical and electrical power in electric drives

I want to ask a question to respected specialists in electric drives. It is known that the mechanical power of an electric motor is determined by a simple formula: \${P_{mech}}= M {\omega}\$; ...
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3answers
341 views

Correct way of calculating BLDC torque for a given RPM and Current

A permanent-magnet 3-phase brushless DC electric motor is attached to a load. Motor is operated with vESC6.6 inverter, which is software-limited to 140A. Measured efficiency at maximum power is 81%. ...
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1answer
26 views

What affects the current ratings on constant torque pole changing motors?

Two different motors, one is rated 1.49A on slow speed configuration and 1.43A on high speed. The other motor is rated 6.09A on slow speed and 6.99A on high speed. These are constant torque pole ...
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1answer
36 views

Running 3 phase asynchronous motor below nominal torque

In class we have a 3 phase asynchronous motor which says 400V delta 690V star. The nominal torque of the motor is 3,7Nm. Can the motor run safely nominal charged on 400V in star configuration? I'm ...
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5answers
1k views

Can I measure torque accurately by an electrical or electronic method?

I am a Btech. student from India. We have been given a project in which we have to design a micro-torsion testing device. We are planning to clamp the specimen and rotate one end by fixed angles ...
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4answers
2k views

Can a DC brushless motor produce the same torque at different power levels?

I am looking these Neo Brushless motors for a project. Here are the links to the data sheet and also to stall testing from the company: http://www.revrobotics.com/neo-brushless-motor-locked-rotor-...

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